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在对地下爆炸地表震动特性进行分析的基础上,对地下爆炸地震效应的评价标准进行了分析与探讨,通过解析的方法,建立了地下爆炸地表运动计算模型和震动反应谱。计算结果表明:地下爆炸地表运动存在两组波群,在评价波对于建筑物的作用时应当考虑到第2波群中粒子运动的周期比第1波群的粒子运动周期长1.5～2.0倍;地面建筑物的响应取决于建筑物的固有频率、阻尼和地震的频率、振幅;对于小当量一次性爆破,震动频率高而震动时间短,可以忽略地表震动频率对结构的影响;但是对于大当量爆炸地震安全问题,不应当忽略频率的影响;对于双层建筑物,第2层结构的不稳定运动有大振幅的特点。
Based on the analysis of the vibration characteristics of the ground surface explosion, the evaluation criteria for the seismic effect of the underground explosion are analyzed and discussed. The ground motion model and the vibration response spectrum of the underground explosion are established by the analytical method. The calculation results show that there are two groups of wave groups in the surface groundwater explosion. When evaluating the effect of waves on buildings, the period of particle movement in the second wave group should be considered to be 1.5-2.0 times longer than that of the first wave group. The response of ground buildings depends on the natural frequency, damping and seismic frequency and amplitude of buildings; for small equivalent one-shot blasting, the vibration frequency is high and the vibration time is short, so the influence of surface vibration frequency on the structure can be ignored; however, for large equivalent For the safety of explosion and earthquake, the influence of frequency should not be neglected. For two-storey buildings, the instability of the structure of the second floor has the characteristics of large amplitude.